Propeller.



T. ROGGENBUGKi PROPBLLEB..

APPLIoATIoN FILED sans, 1909.

Patented Sept.27, 1910.

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PROPEILER.

Specification of Letters Patent.

Patented Sept. 27, i910.

Application filed September 2, 1909. Serial No. 515,767.

To all whom it may concern:

Be it known that I, THEODORE ROGGEN- BUCK, citizen of the United States,residing in the city and county of San Francisco and State ofCalifornia, have invented new and useful Improvements in Propellers, ofwhich the following is a specification.

My invention relates to improvements in propellers which are designedfor movement in liquids or aerial fluids.

It consists in a novel construction of propeller blades havingoverhanging extensions at the ends, and inturned flanges from the endsof the projecting overhangs.

It also comprises details of construction which will be more fullyexplained by reference to the accompanying drawings, in which- Figure lis a perspective view of the propellers. Fig. 2 is a plan. Fig. 3 is aside elevation.

It is the object of my improved propeller to provide a means whereby thefluid in which it revolves will be retained, and prevented from beingthrown outwardly by the centrifugal action of the propeller, and bybeing thus retained, to concentrate the action in the direction in whichit is desired to drive the vessel to which the propeller is attached. Bymeans of the overhanging attachments I am enabled to produce a certainamount of compression in the direction of travel.

As shown in the accompanying drawings, A is a shaft to which propellerblades 2 are attached. These propeller blades may have any suitable ordesired pitch, and from the outer ends of the blades projecting platesor segments 3 extend substantially parallel with the axis. These platesor segments extend the full length of the outer ends of the propellerblades, which are here shown as divergent from the center, and theplates are extended rearwardly from the front edges of the blades, asshown. The rear edges of these plates have inturned flanges 4 of shallowdepth, and the plates may also be curved upon the radius of the axis ofthe propeller blades, so that they will be easily impelled through thefluid in which they re volve. I prefer to converge the plates slightlyfrom the front to the rear, and they may also be inclined inwardly.

The operation will then be as follows: The propeller blades beingrevolved, and having any desired pitch, will impinge on the fluidthrough which they are revolving, with a tendency to force the fluidback, or advance the apparatus to which they may be attached. At thesame time the ovcrhanging plates 3 will cause a body through which thepropellers revolve, which is of equal diameter with the propellers, tobe retained within the circle of revolution of the propellers. Theinturned flanges l are here shown as being deepest at the front andgradually converging to an apex at the rear; the general effect being toin a measure compress the fluid, if it is air or an eleastic fluid, andto considerably increase the effective work of the propellers.

Having thus described my invention, what I claim and desire to secure byLetters Patent is- 1. The combination in a propeller of radial andpitched vanes, said vanes having overhanging plates at the ends with theouter edges of said plates inturned substantially toward the axis of thepropeller.

2. The combination in a propeller, of radial and pitched blades havingoverhanging transverse plates at the outer' ends, said plates havinglianges inturned substantially toward each other and toward the axis ofthe propeller.

3. The combination in a propeller, of radial and pitched blades,overhanging plates extending transversely from the outer edges of theblades said plates having inturned flanges projecting from their edges,and said plates being sections of a cylindrical surface coaxial with thepropeller.

4. The combination in a propeller, of radial and pitched blades havingcurved transverse plates at the outer ends, and inturned convergentflanges projecting from the edges of the plates substantially toward theaxis of the propeller.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

THEODORE ROGGENBUCK.

Witnesses:

GEO. H. STRONG, CHARLES EDELMAN.

